The better a pedal bites into the rubber on your shoes, the better it also bites into the skin on your shins!
I have quite a few scars on my shins from pedals. Seriously, they are a worthwhile investment. Also it's not even just the pins...you're smacking this heavy pedal (that does happen to have pins sticking out of it) into your tibia. Not really something that happens with clipless.
Also skate shoes are usually much more flexible than bike shoes. Just something to consider.